Non-mahrams

Q: I have a sister who is the daughter of my fathers brother and mother's sister, my question is that is she a mahram for me?

Q: In a joint family system, if a husband forces you to live in a shared room where all the family members, including his father and brother sleep, due to the utilization of a single AC. Is it permissible in Islam or not?

Q: Is it permissible to greet or wish a non-mehram on EID? 

Q: A girl has a step mother, can her husband take his step mother in law for Hajj/Umrah? Is he considered as a mahram?

Q: My dad is late (may the Almighty grant him jannat). He has left behind 2 sons and 2 daughters. The eldest son lives with his father in law.

After mummy's iddat, it was her desire to perform umrah and her second son took her Alhamdulillah. The elder son wants to take my mother, his wife and his father in law, who is also a widower, for umrah. Will it be permissable for my mother to travel like this in the company of his father in law?

Q: I'm adopted by my parents. My adopted mother then breastfed me so they became my foster parents. In 2021, my mother (foster mother) passed away and my father got married to another woman. She already has three children. Are they mahraam to me? Should I have to make purdah from them? Is it permissible to marry them at the same time?

Q: Is a man's wife's nephews wife his mahram?

Q: I'd like to know when a lady who has her own kids remarries a man who also has his own children, are the children mahram unto each other?

Q: Does a woman have to make purdah from her father-in-law's brother? Is he considered her Mahram?

Q: Are women allowed to unveil in front of their brother in laws?

Is it true that the brother in law and sister in law can look at each other provided they “keep it professional”?